| 1. | The cylinder dimensions of a compound engine may be designed on the basis of ? | |
|
equal power developed in each cylinder for uniform turning moment
|
||
|
equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
|
||
|
equal temperature drop in each cylinder for economy of steam
|
||
|
all of the above
|
||
View Answer
Discuss in Forum
Report Question| 2. | The function of a crosshead is to guide motion of the ................... to prevent it from bending ? | |
|
piston rod
|
||
|
connecting rod
|
||
|
eccentric rod
|
||
|
valve rod
|
||
| 3. | A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly ? | |
|
1.05
|
||
|
2.86
|
||
|
6.65
|
||
|
10.05
|
||
| 4. | A device in which some portion of waste heat of flue gases is recovered to heat the air before! it passes to the furnace for combustion purpose, is known as ? | |
|
superheater
|
||
|
air preheater
|
||
|
economiser
|
||
|
injector
|
||
| 5. | The maximum heat loss is a boiler occurs due to ? | |
|
moisture in fuel
|
||
|
dry flue gases
|
||
|
steam formation
|
||
|
unburnt carbon
|
||
| 6. | A safety valve mainly used with locomotive and marine boilers is ? | |
|
lever safety valve
|
||
|
dead weight safety valve
|
||
|
high steam and low water safety valve
|
||
|
spring loaded safety valve
|
||
| 7. | The indicated thermal efficiency is defined as the ? | |
|
ratio of thermal efficiency to the Rankine efficiency
|
||
|
ratio of brake power to the indicated power
|
||
|
ratio of heat equivalent to indicated power to the energy supplied in steam
|
||
|
product of thermal efficiency and Rankine efficiency
|
||
| 8. | A condenser in a steam power plant ? | |
|
increases expansion ratio of steam
|
||
|
reduces back pressure of steam
|
||
|
reduces temperature of exhaust steam
|
||
|
all of these
|
||
| 9. | The function of a piston in a steam engine is ? | |
|
to guide motion of the piston rod and to prevent it from bending
|
||
|
to transfer motion from the piston to the cross-head
|
||
|
to convert heat energy of the steam into mechanical work
|
||
|
to exhaust steam from the cylinder at proper moment
|
||
| 10. | Cut-off governing as compared to throttle governing is ? | |
|
less efficient and less economical
|
||
|
less efficient and more economical
|
||
|
more efficient and less economical
|
||
|
more efficient and more economical
|
||